Changes around us

  
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1. Changes that leads to the formation of new substances are called .

2. If the removal of the cause of change leads to regain the original situation, then the change is known as .

3. Burning of wood in chulha is a/an .

4. Melting of candle wax is a/an change.

5. Heat is a form of .

6. Glowing of an is a reversible change.